| Basis for focus area |
Surface outcrops, historical prospects, mined areas. |
| Identified resources |
Historical production of barite and zinc. |
| Production |
Unknown. |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Clark and others (1993), scale 1:500,000; Byerly and others (1969), scale 1:24,000; Byerly and Maher (1996), scale 1:24,000; Jewell (2010), scale 1:24,000; Kohl (2002), scale 1:24,000; Lemiszki (2003), scale 1:24,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Knox Group Upper Ordovician carbonates. |
| Deposits |
Fall Branch (MRDS dep_id: 10227452); Group of mines, prospects, and occurrences in a zone that extends 40 miles along bedrock strike and is 2 to 3 miles wide. |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Documented mineralization (sphalerite, barite, pyrite, chalcopyrite) and trace element analyses. |
| Geophysical evidence |
None. |
| Evidence from other sources |
None. |
| Comments |
According to Maher (1970): "Unresolved geologic problems and the lack of information make any evaluation of the district hazardous. |
| Cover thickness and description |
Some open-pit mining; depth to bedrock may be estimated from available water well logs in the area. |
| Authors |
Peter J. Lemiszki. |
| New data needs |
Geophysical data and geochemical analyses. |
| Geologic mapping and modeling needs |
Geologic mapping adequate. |
| Geophysical survey and modeling needs |
High resolution geophysical coverage. Note that the timing of the deposits is uncertain; they may have been transported on thrust sheets. |
| Digital elevation data needs |
Lidar adequate. |
